3.4.显示版本信息
命令：
who --version
[root@rhel77 ~]# who --version
who (GNU coreutils) 8.22
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Written by Joseph Arceneaux, David MacKenzie, and Michael Stone.
[root@rhel77 ~]#
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版权声明：本文为CSDN博主「小黑要上天」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/z19861216/article/details/131501956
